As far as I know - 3.1 Gen 2 is what 3.1 would have been called if they named it properly, 3.1 Gen 1 is equivalent to 3.0. (the 3.0 line is 3.2g1/3.1g1/3.0, the 3.1 line is 3.2g2/3.1g2, and 3.2 is 3.2g2x2?)

At this point I'm certain the confusion is intentional